"0" is written in the HWID field and changing this field patches not the real HWID, but some other bytes.
This is firmwares is a "correct" one, i.e. the third DWORD of fw_all.bin points to the HWID when it's loaded at the right location.

Hi Turbo,
It's great to have you working on this stuff to help overcome the Garmin greed machine.
I have a US Zumo550 which I want to convert to a JP Zumo. The Japanese firmware includes not only the Kanji support, but also a phone number searching and Kanji input.

Is there any one you know of who's successfully re-flashed a US Zumo550 with a Japanese GCD? I'd like to ask what basic steps to follow and to try to avoid bricking my Zumo. I have the latest Japanese GCD v3.30 file already.

Would be really grateful for any suggestions/advice from you or any other Noeman members.

Not really a help from my side, but the phone number searching won't work.
This is a feature which has to be supported by the map

Hi Tom,
I already have the Japanese NT v11 map, and it's loaded on my US Zumo550. I can see the route numbers, but obviously the Kanji cannot be displayed (just Gibberish) because I've not figured out how to convert/re-flash the Zumo with the Japanese firmware.

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